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You should also have a look at Signal Bandwidth for more information.
Gain Bandwidth Product
Amplifiers have a performance measurement called gain bandwidth product (GBP). This sounds complicated but it's simple enough.
For example if an amplifier has a GBP of one million ...
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a signal at 1Hz can be amplified a million times. Gain x Frequency = One Million.
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a signal at 1000Hz can be amplified 1000 times. Gain x Frequency = One Million.
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a signal at 10 000Hz can be amplified 100 times. Gain x Frequency = One Million.
The graph above shows four scenarios ...
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The gain is limited to 10. The amplifier works as expected up to 100 000 Hz. Then the gain begins to drop.
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The gain is limited to 50. The amplifier works as expected up to 20 000 Hz. Then the gain begins to drop.
This is typical for human hearing so the best possible gain is only 50 for a music amplifier with this GBP.
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The gain is limited to 1000. The amplifier works as expected up to 1000 Hz. Then the gain begins to drop.
Voice would sound muffled and be almost impossible to understand.
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The gain is not limited at all but it depends on the frequency as described in the bullet points above.
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